ios点击延时的处理

ios点击时反应存在延时，导致点击感觉慢，用户体验不好
以下方式处理该问题：

//记载fastclick
loadFastClick("./js/fastclick.js", function () {
	FastClick.attach(document.body);
});

/**
 * 动态加载JS
 * @param {string} url 脚本地址
 * @param {function} callback  回调函数
 */
function loadFastClick(url, callback) {
	var head = document.getElementsByTagName('head')[0];
	var script = document.createElement('script');
	script.type = 'text/javascript';
	script.src = url;
	if(typeof(callback)=='function'){
		script.onload = script.onreadystatechange = function () {
			if (!this.readyState || this.readyState === "loaded" || this.readyState === "complete"){
				callback();
				script.onload = script.onreadystatechange = null;
			}
		};
	}
	head.appendChild(script);
}

fastclick地址：https://download.csdn.net/download/tjj3027/10895914